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The Villafranca project: Combining Gaia and ground-based surveys to study Galactic OB groups
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abstract
The Villafranca project is studying Galactic stellar groups with OB stars combining information from $Gaia$ and ground-based surveys. We summarize the status of the project and we present its most important results. The Villafranca project has been used to produce a new astrometric calibration for $Gaia$ (E)DR3, which improves the previous one significantly for bright stars. We have discovered that dynamical interactions among massive stars at a very young age ($\sim$1 Ma or less) can play a significant interaction in the dynamical evolution of clusters. As a consequence, our current view of the massive-star IMF may be distorted and the number of free-floating neutron stars and black holes higher than previously considered.
Forward citations
Cited by 2 Pith papers
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A new Gaia census of OB associations within 1 kpc
A new Gaia-based catalogue identifies 57 kinematically coherent OB associations within 1 kpc of the Sun, twice as many as previously known, and finds most are expanding.
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OB associations: from stellar to galactic scales
A review of OB associations that synthesizes how Gaia data has redefined their members, subgroups, and open clusters, and proposes them as tracers of spiral arm kinematics.
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